DEV: Convert admin API keys to conform to UI guidelines (#30660)

Re-opening of #30096. It was reverted because it was missing a sidebar link to Webhooks in the admin panel.

app/controllers/admin/api_controller.rb

@@ -14,6 +14,7 @@ class Admin::ApiController < Admin::AdminController
       ApiKey
         .where(hidden: false)
         .includes(:user)
+        .includes(:created_by)
         .order("revoked_at DESC NULLS FIRST, created_at DESC")
         .offset(offset)
         .limit(limit)